[PATCH v2 03/14] pinctrl-ingenic: add a pinctrl driver for the Ingenic jz47xx SoCs

From: Paul Cercueil <paul-icTtO2rgO2OTuSrc4Mpeew@public.gmane.org>
To: Linus Walleij
	<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Ralf Baechle <ralf-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>,
	Ulf Hansson <ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Boris Brezillon
	<boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Bartlomiej Zolnierkiewicz
	<b.zolnierkie-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	Maarten ter Huurne
	<maarten-Ph2Y2OKCxY1M656bX5wj8A@public.gmane.org>,
	Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>,
	Paul Burton <paul.burton-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org>,
	linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org,
	linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-pwm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	james.hogan-1AXoQHu6uovQT0dZR+AlfA@public.gmane.org,
	Paul Cercueil <paul-icTtO2rgO2OTuSrc4Mpeew@public.gmane.org>
Subject: [PATCH v2 03/14] pinctrl-ingenic: add a pinctrl driver for the Ingenic jz47xx SoCs
Date: Sun, 22 Jan 2017 15:49:36 +0100	[thread overview]
Message-ID: <20170122144947.16158-4-paul@crapouillou.net> (raw)
In-Reply-To: <20170122144947.16158-1-paul-icTtO2rgO2OTuSrc4Mpeew@public.gmane.org>

This driver handles pin configuration and pin muxing for the
JZ4740 and JZ4780 SoCs from Ingenic.

Signed-off-by: Paul Cercueil <paul-icTtO2rgO2OTuSrc4Mpeew@public.gmane.org>
---
 drivers/pinctrl/Kconfig           |   8 +
 drivers/pinctrl/Makefile          |   1 +
 drivers/pinctrl/pinctrl-ingenic.c | 488 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 497 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-ingenic.c

v2: Consider it's a new patch. Completely rewritten from v1.

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 8f8c2af45781..2312e21ca48d 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -285,6 +285,14 @@ config PINCTRL_ZYNQ
 	help
 	  This selects the pinctrl driver for Xilinx Zynq.
 
+config PINCTRL_INGENIC
+	bool "Pinctrl driver for the Ingenic JZ47xx SoCs"
+	default y
+	depends on MACH_INGENIC || COMPILE_TEST
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+
 source "drivers/pinctrl/aspeed/Kconfig"
 source "drivers/pinctrl/bcm/Kconfig"
 source "drivers/pinctrl/berlin/Kconfig"
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index a251f439626f..80f327239d4b 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_PINCTRL_LPC18XX)	+= pinctrl-lpc18xx.o
 obj-$(CONFIG_PINCTRL_TB10X)	+= pinctrl-tb10x.o
 obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 obj-$(CONFIG_PINCTRL_ZYNQ)	+= pinctrl-zynq.o
+obj-$(CONFIG_PINCTRL_INGENIC)	+= pinctrl-ingenic.o
 
 obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
 obj-y				+= bcm/
diff --git a/drivers/pinctrl/pinctrl-ingenic.c b/drivers/pinctrl/pinctrl-ingenic.c
new file mode 100644
index 000000000000..ce36cf509eb1
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-ingenic.c
@@ -0,0 +1,488 @@
+/*
+ * Ingenic SoCs pinctrl driver
+ *
+ * Copyright (c) 2017 Paul Cercueil <paul-icTtO2rgO2OTuSrc4Mpeew@public.gmane.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/compiler.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinmux.h"
+
+#define JZ4740_GPIO_DATA	0x10
+#define JZ4740_GPIO_PULL_DIS	0x30
+#define JZ4740_GPIO_FUNC	0x40
+#define JZ4740_GPIO_SELECT	0x50
+#define JZ4740_GPIO_DIR		0x60
+#define JZ4740_GPIO_TRIG	0x70
+#define JZ4740_GPIO_FLAG	0x80
+
+#define JZ4780_GPIO_INT		0x10
+#define JZ4780_GPIO_MSK		0x20
+#define JZ4780_GPIO_PAT1	0x30
+#define JZ4780_GPIO_PAT0	0x40
+#define JZ4780_GPIO_FLAG	0x50
+#define JZ4780_GPIO_PEN		0x70
+
+#define REG_SET(x) ((x) + 0x4)
+#define REG_CLEAR(x) ((x) + 0x8)
+
+#define PINS_PER_GPIO_CHIP 32
+#define NUM_MAX_GPIO_CHIPS 6
+
+enum jz_version {
+	ID_JZ4740,
+	ID_JZ4780,
+};
+
+struct ingenic_pinctrl {
+	struct device *dev;
+	void __iomem *base;
+	struct pinctrl_dev *pctl;
+	struct pinctrl_pin_desc *pdesc;
+	enum jz_version version;
+
+	u32 pull_ups[NUM_MAX_GPIO_CHIPS];
+	u32 pull_downs[NUM_MAX_GPIO_CHIPS];
+};
+
+static inline void ingenic_config_pin(struct ingenic_pinctrl *jzpc,
+		unsigned int pin, u8 reg, bool set)
+{
+	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
+	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
+
+	writel(BIT(idx), jzpc->base + offt * 0x100 +
+			(set ? REG_SET(reg) : REG_CLEAR(reg)));
+}
+
+static inline bool ingenic_get_pin_config(struct ingenic_pinctrl *jzpc,
+		unsigned int pin, u8 reg)
+{
+	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
+	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
+
+	return readl(jzpc->base + offt * 0x100 + reg) & BIT(idx);
+}
+
+static struct pinctrl_ops ingenic_pctlops = {
+	.get_groups_count = pinctrl_generic_get_group_count,
+	.get_group_name = pinctrl_generic_get_group_name,
+	.get_group_pins = pinctrl_generic_get_group_pins,
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
+	.dt_free_map = pinconf_generic_dt_free_map,
+};
+
+static int ingenic_pinmux_set_pin_fn(struct ingenic_pinctrl *jzpc,
+		int pin, int func)
+{
+	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
+	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
+
+	dev_dbg(jzpc->dev, "set pin P%c%u to function %u\n",
+			'A' + offt, idx, func);
+
+	if (jzpc->version >= ID_JZ4780) {
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_INT, false);
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_MSK, false);
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_PAT1, func & 0x2);
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_PAT0, func & 0x1);
+	} else {
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_FUNC, true);
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_TRIG, func & 0x2);
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_SELECT, func > 0);
+	}
+
+	return 0;
+}
+
+static int ingenic_pinmux_set_mux(struct pinctrl_dev *pctldev,
+		unsigned int selector, unsigned int group)
+{
+	struct ingenic_pinctrl *jzpc = pinctrl_dev_get_drvdata(pctldev);
+	struct function_desc *func;
+	struct group_desc *grp;
+	unsigned int i;
+
+	func = pinmux_generic_get_function(pctldev, selector);
+	if (!func)
+		return -EINVAL;
+
+	grp = pinctrl_generic_get_group(pctldev, group);
+	if (!grp)
+		return -EINVAL;
+
+	dev_dbg(pctldev->dev, "enable function %s group %s\n",
+		func->name, grp->name);
+
+	for (i = 0; i < grp->num_pins; i++) {
+		int *pin_modes = grp->data;
+
+		ingenic_pinmux_set_pin_fn(jzpc, grp->pins[i], pin_modes[i]);
+	}
+
+	return 0;
+}
+
+static int ingenic_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
+		struct pinctrl_gpio_range *range,
+		unsigned int pin, bool input)
+{
+	struct ingenic_pinctrl *jzpc = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
+	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
+
+	dev_dbg(pctldev->dev, "set pin P%c%u to %sput\n",
+			'A' + offt, idx, input ? "in" : "out");
+
+	if (jzpc->version >= ID_JZ4780) {
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_INT, false);
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_MSK, true);
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_PAT1, input);
+	} else {
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_SELECT, false);
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_DIR, input);
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_FUNC, false);
+	}
+
+	return 0;
+}
+
+static struct pinmux_ops ingenic_pmxops = {
+	.get_functions_count = pinmux_generic_get_function_count,
+	.get_function_name = pinmux_generic_get_function_name,
+	.get_function_groups = pinmux_generic_get_function_groups,
+	.set_mux = ingenic_pinmux_set_mux,
+	.gpio_set_direction = ingenic_pinmux_gpio_set_direction,
+};
+
+static int ingenic_pinconf_get(struct pinctrl_dev *pctldev,
+		unsigned int pin, unsigned long *config)
+{
+	struct ingenic_pinctrl *jzpc = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
+	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
+	bool pull;
+
+	if (jzpc->version >= ID_JZ4780)
+		pull = !ingenic_get_pin_config(jzpc, pin, JZ4780_GPIO_PEN);
+	else
+		pull = !ingenic_get_pin_config(jzpc, pin, JZ4740_GPIO_PULL_DIS);
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		if (pull)
+			return -EINVAL;
+		break;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		if (!pull || !(jzpc->pull_ups[offt] & BIT(idx)))
+			return -EINVAL;
+		break;
+
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		if (!pull || !(jzpc->pull_downs[offt] & BIT(idx)))
+			return -EINVAL;
+		break;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+	*config = pinconf_to_config_packed(param, 1);
+	return 0;
+}
+
+static void ingenic_set_bias(struct ingenic_pinctrl *jzpc,
+		unsigned int pin, bool enabled)
+{
+	if (jzpc->version >= ID_JZ4780)
+		ingenic_config_pin(jzpc, pin, JZ4780_GPIO_PEN, !enabled);
+	else
+		ingenic_config_pin(jzpc, pin, JZ4740_GPIO_PULL_DIS, !enabled);
+}
+
+static int ingenic_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+		unsigned long *configs, unsigned int num_configs)
+{
+	struct ingenic_pinctrl *jzpc = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int idx = pin % PINS_PER_GPIO_CHIP;
+	unsigned int offt = pin / PINS_PER_GPIO_CHIP;
+	unsigned int cfg;
+
+	for (cfg = 0; cfg < num_configs; cfg++) {
+		switch (pinconf_to_config_param(configs[cfg])) {
+		case PIN_CONFIG_BIAS_DISABLE:
+		case PIN_CONFIG_BIAS_PULL_UP:
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			continue;
+		default:
+			return -ENOTSUPP;
+		}
+	}
+
+	for (cfg = 0; cfg < num_configs; cfg++) {
+		switch (pinconf_to_config_param(configs[cfg])) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			dev_dbg(jzpc->dev, "disable pull-over for pin P%c%u\n",
+					'A' + offt, idx);
+			ingenic_set_bias(jzpc, pin, false);
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			if (!(jzpc->pull_ups[offt] & BIT(idx)))
+				return -EINVAL;
+			dev_dbg(jzpc->dev, "set pull-up for pin P%c%u\n",
+					'A' + offt, idx);
+			ingenic_set_bias(jzpc, pin, true);
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			if (!(jzpc->pull_downs[offt] & BIT(idx)))
+				return -EINVAL;
+			dev_dbg(jzpc->dev, "set pull-down for pin P%c%u\n",
+					'A' + offt, idx);
+			ingenic_set_bias(jzpc, pin, true);
+			break;
+
+		default:
+			unreachable();
+		}
+	}
+
+	return 0;
+}
+
+static int ingenic_pinconf_group_get(struct pinctrl_dev *pctldev,
+		unsigned int group, unsigned long *config)
+{
+	const unsigned *pins;
+	unsigned int i, npins, old = 0;
+	int ret;
+
+	ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < npins; i++) {
+		if (ingenic_pinconf_get(pctldev, pins[i], config))
+			return -ENOTSUPP;
+
+		/* configs do not match between two pins */
+		if (i && (old != *config))
+			return -ENOTSUPP;
+
+		old = *config;
+	}
+
+	return 0;
+}
+
+static int ingenic_pinconf_group_set(struct pinctrl_dev *pctldev,
+		unsigned int group, unsigned long *configs,
+		unsigned int num_configs)
+{
+	const unsigned *pins;
+	unsigned int i, npins;
+	int ret;
+
+	ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < npins; i++) {
+		ret = ingenic_pinconf_set(pctldev,
+				pins[i], configs, num_configs);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static struct pinconf_ops ingenic_confops = {
+	.is_generic = true,
+	.pin_config_get = ingenic_pinconf_get,
+	.pin_config_set = ingenic_pinconf_set,
+	.pin_config_group_get = ingenic_pinconf_group_get,
+	.pin_config_group_set = ingenic_pinconf_group_set,
+};
+
+static int ingenic_pinctrl_parse_dt_func(struct ingenic_pinctrl *jzpc,
+		struct device_node *np)
+{
+	unsigned int num_groups;
+	struct device_node *group_node;
+	unsigned int i, j;
+	int err, npins, *pins, *confs;
+	const char **groups;
+
+	num_groups = of_get_child_count(np);
+	groups = devm_kzalloc(jzpc->dev,
+			sizeof(*groups) * num_groups, GFP_KERNEL);
+	if (!groups)
+		return -ENOMEM;
+
+	i = 0;
+	for_each_child_of_node(np, group_node) {
+		groups[i++] = group_node->name;
+
+		npins = of_property_count_elems_of_size(group_node,
+				"ingenic,pins", 8);
+		if (npins < 0)
+			return npins;
+
+		pins = devm_kzalloc(jzpc->dev,
+				sizeof(*pins) * npins, GFP_KERNEL);
+		confs = devm_kzalloc(jzpc->dev,
+				sizeof(*confs) * npins, GFP_KERNEL);
+		if (!pins || !confs)
+			return -ENOMEM;
+
+		for (j = 0; j < npins; j++) {
+			of_property_read_u32_index(group_node,
+					"ingenic,pins", j * 2, &pins[j]);
+
+			of_property_read_u32_index(group_node,
+					"ingenic,pins", j * 2 + 1, &confs[j]);
+		}
+
+		err = pinctrl_generic_add_group(jzpc->pctl, group_node->name,
+				pins, npins, confs);
+		if (err)
+			return err;
+	}
+
+	return pinmux_generic_add_function(jzpc->pctl, np->name,
+			groups, num_groups, NULL);
+}
+
+static const struct of_device_id ingenic_pinctrl_of_match[] = {
+	{ .compatible = "ingenic,jz4740-pinctrl", .data = (void *) ID_JZ4740 },
+	{ .compatible = "ingenic,jz4780-pinctrl", .data = (void *) ID_JZ4780 },
+	{},
+};
+
+int ingenic_pinctrl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ingenic_pinctrl *jzpc;
+	struct pinctrl_desc *pctl_desc;
+	struct device_node *np, *functions_node;
+	const struct of_device_id *of_id = of_match_device(
+			ingenic_pinctrl_of_match, dev);
+	unsigned int i, num_chips;
+	int err;
+
+	jzpc = devm_kzalloc(dev, sizeof(*jzpc), GFP_KERNEL);
+	if (!jzpc)
+		return -ENOMEM;
+
+	jzpc->base = of_iomap(dev->of_node, 0);
+	if (!jzpc->base) {
+		dev_err(dev, "failed to map IO memory\n");
+		return -ENXIO;
+	}
+
+	jzpc->dev = dev;
+	dev_set_drvdata(dev, jzpc);
+
+	jzpc->version = (enum jz_version)of_id->data;
+
+	if (jzpc->version >= ID_JZ4780)
+		num_chips = 6;
+	else
+		num_chips = 4;
+
+	/*
+	 * Read the ingenic,pull-ups and ingenic,pull-downs arrays if present in
+	 * the devicetree. Otherwise set all bits to 0xff to consider that
+	 * pull-over resistors are available on all pins.
+	 */
+	err = of_property_read_u32_array(dev->of_node, "ingenic,pull-ups",
+			jzpc->pull_ups, num_chips);
+	if (err)
+		memset(jzpc->pull_ups, 0xff, sizeof(jzpc->pull_ups));
+
+	err = of_property_read_u32_array(dev->of_node, "ingenic,pull-downs",
+			jzpc->pull_downs, num_chips);
+	if (err)
+		memset(jzpc->pull_downs, 0xff, sizeof(jzpc->pull_downs));
+
+	functions_node = of_find_node_by_name(dev->of_node, "functions");
+	if (!functions_node) {
+		dev_err(dev, "Missing \"functions\" devicetree node\n");
+		return -EINVAL;
+	}
+
+	pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL);
+	if (!pctl_desc)
+		return -ENOMEM;
+
+	/* fill in pinctrl_desc structure */
+	pctl_desc->name = dev_name(dev);
+	pctl_desc->owner = THIS_MODULE;
+	pctl_desc->pctlops = &ingenic_pctlops;
+	pctl_desc->pmxops = &ingenic_pmxops;
+	pctl_desc->confops = &ingenic_confops;
+	pctl_desc->npins = num_chips * PINS_PER_GPIO_CHIP;
+	pctl_desc->pins = jzpc->pdesc = devm_kzalloc(&pdev->dev,
+			sizeof(*jzpc->pdesc) * pctl_desc->npins, GFP_KERNEL);
+	if (!jzpc->pdesc)
+		return -ENOMEM;
+
+	for (i = 0; i < pctl_desc->npins; i++) {
+		jzpc->pdesc[i].number = i;
+		jzpc->pdesc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
+						'A' + (i / PINS_PER_GPIO_CHIP),
+						i % PINS_PER_GPIO_CHIP);
+	}
+
+	jzpc->pctl = devm_pinctrl_register(dev, pctl_desc, jzpc);
+	if (!jzpc->pctl) {
+		dev_err(dev, "Failed pinctrl registration\n");
+		return -EINVAL;
+	}
+
+	for_each_child_of_node(functions_node, np) {
+		err = ingenic_pinctrl_parse_dt_func(jzpc, np);
+		if (err) {
+			dev_err(dev, "failed to parse function %s\n",
+					np->full_name);
+			continue;
+		}
+	}
+
+	return 0;
+}
+
+static struct platform_driver ingenic_pinctrl_driver = {
+	.driver = {
+		.name = "pinctrl-ingenic",
+		.of_match_table = of_match_ptr(ingenic_pinctrl_of_match),
+		.suppress_bind_attrs = true,
+	},
+	.probe = ingenic_pinctrl_probe,
+};
+
+static int __init ingenic_pinctrl_drv_register(void)
+{
+	return platform_driver_register(&ingenic_pinctrl_driver);
+}
+postcore_initcall(ingenic_pinctrl_drv_register);
-- 
2.11.0

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